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MAX518BESA

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File Size : 116 KB Manufacturer:MAXIM Description:Lets look at what determines the output frequency. Start by examining the circuit schematic at pin 8 in the upper left hand corner. From pin 8 to pin 5 we have the emitter-base of NPN Q1 and the emitter-base of PNP Q2. Since these two diode drops cancel each other (approximately), the potential at pins 8, 5, and 4 are the same. This means that the voltage from V+ to pin 8 is the same as the voltage across external resistors RA and RB. This is a textbook example of a voltage across two resistors which produce two currents to charge and dis- charge a capacitor between two fixed voltages. This is also a linear system. If the voltage across the resistors is dropped from 10V to 1V, the frequency will drop by 10:1. Changing from 1V to 0.1V will also change the frequency by 10:1. Therefore, by causing the voltage across the external resis- tors to change from say 10V to 10mV, the frequency can be made to vary at least 1000:1. There are, however, several fac- tors which make this large sweep range less than ideal.

	1PCS	100PCS	1K	10K
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型号：MAX518BESA 厂家：MAXIM 封装：SOP8 批号：06+ 数量：150 说明：QQ：104735486 611606076


运费：运费到付10.00元（快递）20.00元（顺风）所在地：深圳新旧程度：